Pump



e. F. LYBECK.

PUMP.

APPLICATION FILE D MAR. 7, I922 1,426,206, Patented Aug. 15, 1922.,

GUNNAR FREDBIK LYBECK, OF GOTTENBORG, SWEDEN.

PUMP.

To all w 7mm it may concern Be it known that I, GUNNAR Fnnnnm LYBECK, asubject of the King of Sweden, residing at Gottenborg, in the county ofGottenborg and Bohus and Kingdom of Sweden, have invented a new anduseful Improvement in Pumps, of which the following is a specification.

This invention refers to pumps and especially to centrifugal pumpswith'automatic working engines.

In such a pump, which is drawing water out of a well or the like, it mayoccur, in case the water int-he well should be running short, that thesuction pipe will suck in air. It also happens that the suction pipe ischoked by impurities, hydrophytes, etc, or that an air leak will ariseon the same, whereby it looses its suctionpower. Under suchcircumstances the pump cannot again operate to take water, before thefault is relieved, and the pump and also the suction pipe are againfilled with water. When thus there is no new water coming through thesuction pipe, the water being in the pumpwill be stagnant,'and also thepump will be heated through the rotation of the wheel. If such a mishapoccurs and the suction pipe should not be immediately observed thecontinuous running of the motor and pump will so increase thetemperature of the different parts of the motor or pump to cause damagethereto. Also the bearings may run hot, which in its turncausesextensive damages in the machinery.

The object of this invention therefore is to provide an arrangement toprevent that the'temperature of the pump from'rising to such a degreethat damages can arise in consequense thereof. p

The principal of one modification of the invention is illustrated in theaccompanying drawing, where 1 indicates an electric motor driving acentrifugal pump 2. On this pump 2 or on a member being in connectionwith the same by means of a conductor of heat there is applied a meltingbody 6, made of a mass or alloying of'metals nieltableat a certaindegree of heat, and preferably of such a material, that the body 6 willmelt down already at a temperature, which does not damage the pump. Thebody 6 is connected by means of a Wire rope 7 with one Specification ofLetters Patent. Patented A 0; 15 Application filed March 7, 1922.

Serial No. 541,877.

of the arms of a doublearmed level 8 turn able arounda pin 9. The otherarm of the means of a springlO against the handle at of a currentienciesabove mentioned will occur. is run ning in such temperature that thebody 6 melts,.the wire 7 looses its fastening in the puap, and thespring 10 forces the' lever 41 out of its position, 7

8v to press the" handle whereby the current-circuit will be broken, andthe motor and the, pump are stopped.

Having thus fully described the invention, what I claim as new, anddesire to secure by Letters Patent, is:

1. In an apparatus of the character de scribed, the combination with acircuit; breaker, and,,.an electrically driven devicev capable ofbecoming overheated on con- J[111110119OPQEBJZIOH, of'a melting body forapplication on the and means associated with the circuit breaker andoperably connected with the body for.

breaking the circuit upon the melting of the body. i y 7 2. A device asclaimed in claim 1, wherein themeans includes an automatically operatedlever for actuating'the circuit breaker and a normally tautbre'akerconnected with body. I y

.3. In a device of the character described, in combination a pump, anelectric motor for driving' the pump, circuit breaker, a melting bodyapplied to the pump and adapted to be heated by the water enclosed inthe. pump,- means associated with the cir-' cuit breaker and operablyconnected with the melting body for breaking the circuit upon themeltingof the body, v

' at. A device as claimed in claim 3 wherein the means includesapivotally mounted lever in proximity tothe circuit breaker, an f 100'. I

actuating'spring connected with the flever electrically driven device,f

and a flexible connection secured tothe lever and the melting body,substantially as and for the purpose set forth. I

In testimony whereof I have affixed my.

signature.

GUN N AR FREDRIK LYBEOK.

85 the lever. and connected with themelting

